Study on Shortcut Nitrification and Denitrification at Ambient Temperature

The shortcut nitrification and denitrification in SBR was realized by controlling pH and aeration rate at ambient temperature of 20 to 30 ℃.The results show that the high pH is favorable to ammonia nitrogen oxidation and nitrite accumulation.The low aeration rate can increase the nitrite accumulation rate.When the DO is 0.4 to 0.7 mg/L(aeration rate of 0.1 L/min),pH is 8.3,and the influent ammonia nitrogen is 50 mg/L,the nitrite accumulation rate can achieve more than 70%.The high concentration of ammonia nitrogen in the influent has significant inhibition of nitrobacteria and little influence on nitrosobacteria.The nitrite accumulation rate can achieve 80% when the influent ammonia nitrogen is 120 mg/L.